Lub hauv paus ua kom muaj tus sawv thiab lub caij nplooj zeeg yog txiav txim los ntawm cov yam ntxwv ntawm cov khoom. Yuav kom daws tau qhov teeb meem ntawm lub shrinkage ntawm lub Txhav-packaging PCB Board , cia peb ib tug nyuag taw qhia rau cov khoom ntawm saj zawg zog phaj Polyimide:
(1) polyimide muaj zoo heev thermal kev ua tau zoo, yuav withstand thermal poob siab ntawm cov hlau lead-free soldering tshav kub kev kho mob;
(2) Feem ntau cov pab kiag li lawm manufacturers yuav siv saj zawg zog circuits board rau me me pab kiag li lawm uas yuav tsum tau mus sab laj txog lub teeb liab sam xeeb;
(3) Polyimide muaj ib tug high iav hloov kub thiab siab melting point yam ntxwv,
ib txwm muaj tshwm sim yuav tsum tau ua nyob rau hauv 350 ℃ los yog ntau tshaj;
(4) Nyob rau hauv cov organic xaus, polyimide yog insoluble nyob rau hauv ntau organic solvents.
Saj zawg zog phaj cov ntaub ntawv uas mus txog thiab nrog cov ntsiab puag cov ntaub ntawv uas PI thiab lo muaj ib tug kev sib raug zoo, uas yog, ib tug zoo kawg kev sib raug zoo nrog cov imidation ntawm PI, ntau dua qhov lub degree ntawm imidization, lub zog lub controllability.
Raws li ib txwm ntau lawm kev cai, tom qab saj zawg zog board txiav, thiab tsim los ntawm cov graphics kab, thiab ua ke nrog ntawm yeem thiab mos mos nyob rau hauv tus txheej txheem ntawm compression yuav muaj cov zaubmov ntawm kev loj hlob thiab contraction nyob rau hauv lub graphics kab etching, txoj kab kev siv thiab cov kev taw qhia , yuav ua rau lub reorientation ntawm txoj kev nyuaj siab ntawm tag nrho lub board, thiab nws thiaj li ua rau cov kev cai ntawm lub Rooj Tswjhwm Saib thiab nce thiab nqis hloov; nyob rau hauv tus txheej txheem ntawm combining qhov muag thiab nyuaj, raws li cov nto yuav tsum vov zaj duab xis thiab hauv lub hauv paus cov ntaub ntawv uas PI expansion coefficient yog inconsistent, Nyob rau hauv lub Scope ntawm ib tug tej yam degree ntawm expansion.
Los ntawm cov xwm vim li cas, tej khoom nce thiab yog cuam tshuam los ntawm kub thiab, raws li ib tug tshwm sim ntawm lengthy nyob rau hauv PCB ntau lawm txheej txheem, cov ntaub ntawv uas tom qab ntau kub ntub txheej txheem, siab dua shrinkage nqi yuav muaj txawv degrees ntawm kev hloov maj mam hloov, tab sis nyob rau hauv lub sij hawm ntev ntawm tiag tiag ntau lawm kev, hloov los yog tsis tu ncua.
Yuav ua li cas los tswj thiab txhim kho?
Nruj me ntsis hais lus, tus nrog kev nyuaj siab ntawm txhua tus yob ntawm cov ntaub ntawv uas yog sib txawv, thiab cov txheej txheem tswj ntawm txhua batch ntawm daim hlau yuav tsis tau tib yam nkaus. Yog li ntawd, cov kev tswj ntawm lub coefficient ntawm cov ntaub ntawv uas nthuav tawm no yog raws li nyob rau hauv ib tug loj tus naj npawb ntawm kev sim bases Nyob rau hauv tus txheej txheem tswj thiab cov ntaub ntawv tsom yog tshwj xeeb yog ib qho tseem ceeb. Nyob rau hauv tiag tiag lag luam, lub shrinkage ntawm saj zawg zog phaj yog muab faib mus rau hauv theem:
Cov thawj yog los ntawm cov lus qhib mus rau lub ci daim ntawv, Qhov no yuav tsis nyob ntev no mas tshwm sim los ntawm kub los:
Yuav kom paub meej tias lub ci phaj tshwm sim los ntawm lub siab ntxiv thiab lub caij nplooj zeeg ntawm stability, thawj ua tswj taub hau, nyob rau hauv lub premise ntawm ib tug unified khoom, txhua ci phaj cov cua kub thiab cua txias hauj lwm yuav tsum tau zoo ib yam, tsis blindly caum efficiency, thiab muab tso rau hauv lub tiav lawm daim hlau nyob rau hauv cov huab cua kub dissipation. Tib txoj kev kom txo tau cov internal kev nyuaj siab tshwm sim los ntawm cov ntaub ntawv uas expansion thiab contraction.
Cov thib ob theem tshwm sim nyob rau hauv tus txheej txheem ntawm tus qauv hloov lwm lub tsev. Lub shrinkage ntawm no theem yog tsuas yog tshwm sim los ntawm qhov kev hloov ntawm kev nyuaj siab orientation nyob rau hauv cov khoom.
Yuav kom paub meej tias lub kab hloov lwm lub tsev txheej txheem yog ruaj khov, Tag nrho ci los xij yuav tsis tau grinds, ncaj qha los ntawm cov tshuaj tu kab nto pre-kev kho mob, tom qab siab membrane nto yuav tsum theem tawm, board nto sawv ua ntej thiab tom qab lub tib lub sij hawm yuav tsum yog txaus , tom qab lub finish line hloov lwm lub tsev, vim cov kev hloov ntawm txoj kev nyuaj siab orientation, saj zawg zog phaj yuav nthuav ib tug txawv degree ntawm crimp thiab contraction, yog li zaj duab xis nyiaj tswj kev sib raug zoo ntawm cov kab mus rau lub zog thiab mos mos nyob nrog lub precision tswj, nyob tib lub sij hawm, saj zawg zog phaj nce thiab ascertainment ntawm lub ntau yam ntawm qhov tseem ceeb, yog zus ntawm nws txhawb txhav vaj huam sib luag cov ntaub ntawv hauv paus.
Cov peb theem ntawm lub contraction tshwm sim nyob rau hauv tus txheej txheem ntawm cov zog thiab muag muag board xovxwm, lub ntsiab compression tsis thiab khoom thaj chaw ntawm no theem yog txiav txim.
Yam influencing rau theem no ntawm expansion xws li cov cua kub npaum li cas ntawm lamination, qhov chaw ntawm siab tsis, thiab cov residual tooj liab npaum li cas thiab thickness ntawm cov tub ntxhais. Nyob rau hauv dav dav, lub me qhov residual tooj liab npaum li cas, ntau dua qhov lub shrinkage nqi; lub thinner cov tub ntxhais, cov ntau dua tus nqi ntawm cov sawv thiab lub caij nplooj zeeg. Txawm li cas los, los ntawm loj me me, yog ib tug maj mam, yog li zaj duab xis nyiaj yog tshwj xeeb yog ib qho tseem ceeb. Nyob rau hauv tas li ntawd, vim qhov xwm ntawm tus saj zawg zog board thiab txhav board khoom, nws cov nyiaj yog ib tug ntxiv tau uas yuav tsum tau suav hais tias.